Hold the ball at chest height with both hands. You then bounce the ball between your legs. Move both hands from front to back, catching the ball behind your back. Attempt to slam the ball through your legs as hard as you can.
Instead of catching the ball behind the back, rotate the hands above your head and catch the ball on the back of your neck.
This basketball drill is licensed under a Creative Commons License. This drill is from Pål Degerstrøm at www.degerstrom.com/basketball.